Definition:Repunit/Index
< Definition:Repunit(Redirected from Definition:Index of Repunit)
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Definition
The index of a repunit is the number of digits it has.
Thus a repunit with $n$ digits can be referred to as $R_n$.
Linguistic Note
The derivation of the term repunit is clear: it comes from repeated unit.
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $1,111,111,111,111,111,111$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $1,111,111,111,111,111,111$